Liquid-level indicator



Nov. 18, 1930. -T. M. EYNON LIQuIb Lavar. IunIcATon J-iled Feb. 25, 1924 ATTORNEYS.

Patented Nov. 18,k 1930 l '.THoMAsyivLnunonoFrrrr'LnnnLHIA, PENNSYLVANIA Application l'intarelmiary 25,:1924.ff1ffsria1 No.5 695,007...

l invention relatesy to a new and useful liquidy level indicator wherein, an indicating fluid is employed which is actuated by air pressure .createdby theriseliand fall ofthe 5 level f the liquidintatanl: to which the detion;l l Y s A s y 2, represents a section on liner2-2, Fig/1. f Y i' vice isapplied. `f Y My invention further relates to a novel liquid-level indicator. whereby the level ofthe liquidfin the `tank yis ascertained not .by the direct reading/of a ysinglel device, but by thefdiference in the readings of ,two inde.- pendent devices, operated, .simultaneously vand appliedto the same tank. Y

To the above ends' my invention consists of two open ended tubes of dilerent diame-v ters enclosed incasings of the same diameter and positioned in al-tank the level-oftheliquid 'in Awhich is to be ascertained; pipes leading from said tubes to'. the ,upper,'closedr limbs of intercommunicating fU-sh'aped tubes,` the other limbs-of s aidgtubesy being open ,an ir'idicatingfluid` in said U-,shaped tubesg andgraduated means coacting with said indicating fluid-,whereby any rise` 'and fall of the level of said .fluid may be translated interms kof'un'itsto 'indicate thehrise andffall vofthe level of the -liquid'in the tank. It further. consists'of other. novel Vfeatines of constructionv and advantage, all as :willbe hereinafter fully set iforth.

For the .purpose of illustrating my inven* d shown .i in the Vaccompanying Y tion I have drawings one form thereof whichisy at `present preferred `by me,

invention is not l limit vrangement and organization/of `the instru- A Figfl, represents a frontv elevation of a 73H5 liquid level indicator, embodying my invern Fig. 3, represents on Van enlarged scale jing '4` has the differenti Y Lwhose lower endissecured in the ppcollar 11, -.whichj is lixedlysecured `in the bottom of y, said casing, said tube being `of greater diarneter and cap n `its upper end terminating a short distance from the upper collarv 12, secured in the. upper end of the casing 4, said collar receiving nthelower-end ofthe tube 18. VThe upper `ends ofi-,the casings since the same has been f r found'in practice to give satisfactory and reliableA results, although it is to be underl stood that the various instrumentalitiesl of f which. my inventionconsists canV be vtviri-` ously. arranged and organized andl that vmy ed to, the precise ar-fwith.thedmmber'ggthough l s mentalitie'sfas herein shown" and described. dlntheuppepormon ofthe which are slidably. Iand13. lThe upper'end ofth'e tube 9: asfseen inFig 2 communicates 'at -end vof .thechamber 204 of 2.7 designates an upper gasket contacting with a. .f mvertical, sectional view of the casings and portion of Fig. Fig,p14, representsa section on' line of Fig. 1.

'Fig 5,. represents aifronty elevation of n,the

and.v 4 therein,v ofthe same diameter .'and i' length. In. the casing Sis located .the differential tubek 5, whose lower end is secured in the collar 6 positioned in the lower endnof saidpcasing and secured thereinby.,brazingl Vor otherwise, said tube beingopen'atjboth ends andthe upper end .7 terminating ya shortdistance from the collar 8 securedjin the topof the `casing 3 and having secured therein the lower end of the tube 9. The casal` tube` 10 therein,

acity than the tube 5, and having Sand 4 may besecured. to the liangei Min'the cap 2 fof kthe tank by Aany suitable means,

are provided y with the glands` 17and"18,

mounted on the pipes V.9 k19with upper the U-shaped tube.

`and outside .of said top I provide the stulfing boXes15 and 16, which 21, ,which is also provided Awith the chamber y,22, which ,communicates atits lowerfendfif. v the port. 23.V

\ chamber.. 22.5 I place the glass tube 24., whoselower end rests onthe-gasket supported onthe shoulder' 26.

the upper end of the glass tube 24, upon which y isscrewed the plu g or closure i 28 having .a

` port 29 therein leading -to the; atmosphVere!r v f lThe upper end of thechamber 2O isclosed f l' Lbythe solid plug or closureO,Y which-fig ment board against venience in manufacture,

or imperforate. The upper end of the tube 13 communicates with the chamber 31 ofthe U-shaped tube 32, havingxthe front chamber 33 provided with the glass tube 34. The chambers 31 and 33 have a communicating port at their bottom, of the same character as seen in Fig. 2.' 34X designates the instruthe back of which abuts the flange 35. 36 designates a face plate or front plate having the flanges 37',`through` or other 'fastenwhich -'pass the bolts, screws 39 and 40 designate the ing devices 3S.

oppositely located legs or differential readand l ofthe same volumefor size and having the same displacement, are positioned 1n the fio.

fuid in the limbs 22 and 33.

smaller diameter 'of the tube 5, the amount of air. displaced Yliquid inthe tank 1 is less than that displaced Y `empty tank 1, in the manner shown ferent localities.

` as at 29. With the lower Isure is equal at the tubes 5 and l greater compression tween the heights `of the indicating Y the limbs 22 and 33'is directly proportional in Fig. 1, with the open ended inner tubes 5 and 10 of different diameters enclosed therein. The pipes 9 and 13 are intertwined for reinforcement and to insure uniformity of any 'change in temperature to which said tubes may be subjected, vwhich would not be true if these tubes ran spaced from each other or in dif- `The upper ends of' the tubes. 'or pipes 9 and 13 communicate with the closed, u `)perends of the limbs 2O and -31 of the `U`sliaped tubes `21, the other limbs 22 and 33 of which areopen to the atmosphere 5 and 10 andl the upper endsof the limbs 22 and 33 open to the atmosphere, the air presboth ends and the indicating Huid in vthe U-shaped tubes 21 stands at the same level allaround. When the tank lis filled, the liquid first seals the lower ends of 10 and then gradually rises therein to displace the air, and the air in the pipes 9 and 13 is to that extent compressed,

ends of the tubes to the rise of the liquid in the tank 1. For instance, if by placing ten gallons in the tank l, the indicating fluid in the limb 33 rises two inches higher than in the limb 22, it follows that that height represents ten gallons.

It will now be apparent that my invention, being operated solely by variations of pressure or volume within the difierential tubes, is entirely automatic in its operation, and that it dispenses entirely with floats in the tanks and with all mechanical connections, so there is no liability of the apparatus getting out of order after being installed in position, and owing to its great simplicty, and the absence of any mechanical connections, it can be readily installed in any standard tank without the employment of skilled labor.

I am aware that the invention may be embodied in other specific forms without dep arting from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claim rather than to the foregoing description to indicate the scope of the invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is :-V y y In a device of the characterstated, a tank adapted to contain a liquid, apair .of open ended tubes of unequal.V internal volumetric capacity positioned within said tank, a pair of identical U-shaped indicating members having the upper ends of the rear arms thereof closed and the upper ends of the front limbs thereof open, and having indicating fluids inthe lower portions thereof, and a corresponding pair of pipes of unequal diameters leading from the upper endsof said tubes to the `'respective upper closed ends of therear limbs of .said U-shape'd indicating members. Y Y THOMAS M. EYNON.

Vthus increasing the pressure of `the air in the closed ends` of the limbs 20land 31. This results ina higher level of the indicating therefrom by the rise of the from the larger` tube 10. This results in a of yaiiQV in they tube or pipe 13 than takes place inV the tube 9, and the rise of the indicating fluid in the limb 33 (and the glass tube 34) will be greaterfthan that in the limb 22 (andthe glass tube 24;).v Since the rise in both said limbs is due to Vthe rise of the liquid in the tank 1 (a fixed it follows that the difference beliquid in quantity) Due to the 

